CAD file format specifications?

[Anthra Norell]

Dennis Lee Bieber wrote:
> On Thu, 18 Jun 2009 13:39:28 +0200, Anthra Norell
> <anthra.norell at bluewin.ch> declaimed the following in
> gmane.comp.python.general:
>
>
>   
>> utility. So, my question is: How do I convert a bunch of 
>> three-dimensional coordinates defining lines into a file format Sketch 
>> Up can read (skp, dwg, dxf, 3ds, ddf or dem)?
>>
>>     
> 	Most CAD type data files are highly structured -- and the formats
> may be under company control...
>
> http://en.wikipedia.org/wiki/USGS_DEM
> http://rockyweb.cr.usgs.gov/nmpstds/acrodocs/dem/2DEM0198.PDF
>
> http://www.martinreddy.net/gfx/3d/3DS.spec
>   
Dennis, norseman,
   Thanks for your suggestions. First thing I'm trying to write a DXF 
converter using norseman's excellent documentation. It seems I only need 
a simple subset of the DXF format (Entities). When I'm done I shall take 
a close look at the links above. So, thanks again.

Frederic